Even a PC genius would be hard pressed to solve your problem from the details given. It's a bit like asking an automobile mechanic why your car won't run when he doesn't know what make/model it is, he can't see it, and you don't describe any symptoms, or things you have tried, other than "it won't run".
The answer would be completely different for a Tesla than for a Ferrari. And it would be completely different if you had run out of petrol, than if the starter motor didn't work, you had a flat tyre, or the battery was flat.